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> 
> ### test numeric methods, in particular handling of unequal
> ### function lengths
> library(maxLik)
Loading required package: miscTools

Please cite the 'maxLik' package as:
Henningsen, Arne and Toomet, Ott (2011). maxLik: A package for maximum likelihood estimation in R. Computational Statistics 26(3), 443-458. DOI 10.1007/s00180-010-0217-1.

If you have questions, suggestions, or comments regarding the 'maxLik' package, please use its GitHub page and the issues there:
https://github.com/arne-henningsen/maxLik
> 
> f <- function(x) {
+    if(x[1] <= 0)
+        return(NA)
+                            # support of x[1] is (0, Inf)
+    return(c(log(x[1]),x[2]))
+ }
> 
> ng <- numericGradient(f, c(0.01,1), eps=0.1)
Warning message:
In numericGradient(f, c(0.01, 1), eps = 0.1) : Function value at
-0.04  1.00
 =
NA
(length 1) does not conform with the length at original value 2
Component 1 set to NA
> 
> nh <- try(numericHessian(f, t0=c(0.01,1), eps=0.1))
There were 13 warnings (use warnings() to see them)
> 
> proc.time()
   user  system elapsed 
   0.29    0.03    0.31